Calipari described Lyles as ''pretty sick'' after Saturday's 70-55 win over Alabama. During Monday's Southeastern Conference coaches' teleconference, he said he doesn't believe the 6-foot-10 freshman will play Tuesday night against Georgia (14-5, 5-2) and could be out longer.
Lyles is averaging 7.5 points and 5.3 rebounds in 20 games with seven starts for Kentucky (21-0, 8-0).
Despite shooting a season-best 59 percent against Alabama without Lyles, Calipari said Kentucky must figure things out in Lyles' absence.
The coach says, ''We've played well without him, but we're never going to be as good without him because he's a really good player.''